Rate of progression through Alzheimer's disease stages

The rate of progression for Alzheimer's disease varies widely. On average, people with Alzheimer's disease live between three and 11 years after diagnosis. But some live 20 years or more. How far the disease has advanced when diagnosed can affect life expectancy. Untreated vascular risk factors such as high blood pressure are associated with a faster rate of progression of Alzheimer's disease.

Pneumonia is a common cause of death for people with Alzheimer's. Trouble swallowing due to pneumonia allows food or beverages to enter the lungs, where an infection can begin. Other common causes of death include dehydration, malnutrition, falls and other infections.